Search for neutrinoless decays τ→3ℓ

Yusa, Y.; Nagamine, T.; Yamaguchi, A.; Abe, K.; Abe, T.; Adachi, I.; Aihara, H.; Akatsu, M.; Asano, Y.; Aulchenko, V.; Aushev, T.; Bahinipati, S.; Bakich, A. M.; Banaś, E.; Bedny, I.; Bitenc, U.; Bizjak, I.; Bondar, A.; Bożek, A.; Bračko, M.; Browder, T. E.; Chang, M. C.; Cheon, B. G.; Chistov, R.; Choi, Y.; Chuvikov, A.; Danilov, M.; Liu, Dong; Eidelman, S.; Eiges, V.; Enari, Y.; Fratina, S.; Gabyshev, N.; Garmash, A.; Gershon, T.; Gokhroo, G.; Golob, B.; Haba, J.; Hayashii, H.; Hazumi, M.; Hinz, L.; Hokuue, T.; Hoshi, Y.; Hou, W.-S.; Iijima, T.; Inami, K.; Ishikawa, A.; Itoh, R.; Iwasaki, H.; Iwasaki, M.; Kang, J. H.; Kang, J. S.; Kapusta, P.; Katayama, N.; Kawai, H.; Kawasaki, T.; Kichimi, H.; Kim, H. O.; Koppenburg, P.; Korpar, S.; Križan, P.; Krokovny, P.; Kuzmin, A.; Kwon, Y.; Lee, S. H.; Lesiak, T.; Li, J.; Lin, S. W.; MacNaughton, J.; Matsumoto, T.; Matyja, A.; Mikami, Y.; Mitaroff, W.; Miyata, H.; Mohapatra, D.; Moloney, G. R.; Mori, Takashi; Nagasaka, Y.; Nakano, E.; Nakao, M.; Nakazawa, H.; Natkaniec, Z.; Nishida, S.; Nitoh, O.; Nozaki, T.; Ogawa, S.; Ohshima, T.; Okabe, T.; Okuno, S.; Olsen, S. L.; Ostrowicz, W.; Ozaki, H.; Pakhlov, P.; Pałka, H.; Park, H.; Park, K. S.; Parslow, N.; Perroud, J. P.; Piilonen, L. E.; Poluektov, A.; Root, N.; Sagawa, H.; Saitoh, Saburou; Sakai, Y.; Sarangi, T.; Schneider, O.; Schwartz, A. J.; Semenov, S.; Senyo, K.; Sevior, M. E.; Shibuya, H.; Shwartz, B.; Singh, J. B.; Soni, N.; Stanič, S.; Starič, M.; Sumisawa, K.; Sumiyoshi, T.; Suzuki, S.; Tajima, O.; Takasaki, F.; Tamai, K.; Tamura, N.; Tanaka, M.; Teramoto, Y.; Tomura, T.; Tsuboyama, T.; Tsukamoto, T.; Uehara, S.; Uglov, T.; Unno, Y.; Uno, S.; Varner, G.; Wang, C. C.; Wang, C. H.; Yamada, Yukiko; Yamashita, Y.; Yamauchi, M.; Yanai, Haruo; Zhang, J.; Zhang, Z. P.; Zhilich, V.; Ziegler, Thomas; Žontar, D.

doi:10.1016/j.physletb.2004.04.002

Cited by 42 publications

(24 citation statements)

References 30 publications

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“…limit of 1.0 × 10 −12 . In the extended field content case, under the same assumptions, this branching fraction is comparable to the current experimental limit, and the fractions for LFV τ decays are three orders of magnitude smaller than the current limits of 1 − 3 × 10 −7 [8,9]. Note that while the rates for LFV τ decays are larger than for µ → 3e, the higher experimental sensitivity of the latter is on the verge of placing stringent bounds on the theory and therefore it would be highly desirable to pursue higher sensitivity in this mode.…”

Section: Discussionsupporting

confidence: 52%

“…The τ → 3µ branching ratio is governed by |b µτ | 2 , which does not depend on s 13 and for given m min is typically two orders of magnitude larger than |b eµ | 2 , leading to B τ →3µ ∼ 10 −10 . This is below current experimental sensitivities [8,9].…”

Section: Phenomenology: Extended Field Contentcontrasting

confidence: 60%

“…This remains true even when analyzing data beyond the minimal flavor violation hypothesis [17]. We therefore emphasize that it is highly desirable to complement existing experimental efforts [18,8,9] and pursue experimental searches of all the LFV µ and τ decay modes.…”

Section: Discussionmentioning

confidence: 99%

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Phenomenology of minimal lepton flavor violation

Cirigliano

Grinstein

2006

Nuclear Physics B

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We extend the effective theory of Minimal Lepton Flavor Violation (MLFV) by including four-lepton operators. We compute the rates for µ → 3e and τ → 3ℓ decays and point out several new ways to test the hypothesis of MLFV. We also investigate to what extent it will be possible from (future) experimental information to pin down the contributions of different effective operators. In particular we look for experimental handles on quark-lepton operators of the typel i Γℓ j ×qΓq by working out their contribution to hadronic processes such as τ → µπ 0 , π 0 → µē, Υ → τμ, as well as to purely leptonic decays such as µ → 3e through loop effects.

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Section: Discussionsupporting

confidence: 52%

Section: Phenomenology: Extended Field Contentcontrasting

confidence: 60%

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Phenomenology of minimal lepton flavor violation

Cirigliano

Grinstein

2006

Nuclear Physics B

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“…Searches for all six decays have been performed by BABAR (91 fb −1 ) [12] and BELLE (87 fb −1 ) [11]. Upper limits of the order BR(τ → lll) < 2 × 10 −7 were derived.…”

Section: µ → Eγmentioning

confidence: 99%

“…Experimental prospects for µ → eγ are bright with the imminent commencement of the MEG experiment which will probe BR∼ 10 −13 → 10 −14 , two to three orders of magnitude beyond the current upper limit [10]. At the e + e − B factories limits of the order BR(τ → l i l j l k ) < 10 −7 with ∼ 90 fb −1 [11], [12] have been obtained utilizing direct e + e − → τ + τ − production. Simulations of the detection prospects at a proposed high luminosity e + e − B factory with L=5→ 50 ab −1 anticipate sensitivity to BR∼ 10 −8 → 10 −9 [13].…”

Section: Introductionmentioning

confidence: 96%

Lepton flavor violatingτdecays in the left-right symmetric model

2007

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The Left-Right symmetric extension of the Standard Model with Higgs isospin triplets can provide neutrino masses via a TeV scale seesaw mechanism. The doubly charged Higgs bosons H ±± L and H ±± R induce lepton flavour violating decays τ ± → lll at tree-level via a coupling which is related to the Maki-Nakagawa-Sakata matrix (V MNS ). We study the magnitude and correlation of τ ± → lll and µ → eγ with specific assumptions for the origin of the large mixing in V MNS while respecting the stringent bound for µ → eee. It is also shown that an angular asymmetry for τ ± → lll is sensitive to the relative strength of the H ±± L and H ±± R mediated contributions and provides a means of distinguishing models with doubly charged Higgs bosons.

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Flavor physics of leptons and dipole moments

Raidal¹,

Schaaf²,

Bigi³

et al. 2009

Flavor in the Era of the LHC

Self Cite

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This chapter of the report of the "Flavour in the era of the LHC" Workshop discusses the theoretical, phenomenological and experimental issues related to flavour phenomena in the charged lepton sector and in flavour-conserving CP-violating processes. We review the current experimental limits and the main theoretical models for the flavour structure of fundamental particles. We analyze the phenomenological consequences of the available data, setting constraints on explicit models beyond the Standard Model, presenting benchmarks for the discovery potential of forthcoming measurements both at the LHC and at low energy, and exploring options for possible future experiments.

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Search for neutrinoless decays τ→3ℓ

Cited by 42 publications

References 30 publications

Phenomenology of minimal lepton flavor violation

Phenomenology of minimal lepton flavor violation

Lepton flavor violatingτdecays in the left-right symmetric model

Flavor physics of leptons and dipole moments

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